Valve seat grinder



Jan. 13, 1948. J. s. KLEIN, JR 2,434,463

VALVE SEAT GRINDER Filed Oct. 30, 1945 I N VEN TOR.

Patented Jan. 13, 1948 UNITED STATES PATENT OFFICE VALVE SEAT GRINDER Joseph s. Klein, in, Detroit, Mich.

Application October 30, 1945, Serial No. 625.507

2 Claims.

This invention relatesto valve seat grinders the object being to provide anew and improved form of grinder attached to a shaft having a gear thereon and an oscillatable element having a gear of greater diameter than the first gear whereby the grinding element is rotated a little more than a half circle for each oscillation of the driving member.

Valve seat grinders heretofore are commonly oscillated through a half circle and the tool requires to be reversed in order to grind the other half thereby usually leaving an unground part at the limit of movement of the grinder in its oscillation.

In my improved apparatus, in either of th forms shown, the grinding element is turned through more than a half circle for each complete rotation of the driving element.

These and various other objects and features of the invention are hereinafter more fully described and claimed and shown in preferred form in the accompanying drawing in which- Fig. 1 is an elevation of one form of the valve seat grinder.

Fig. 2 is a section taken on line 2-2 of Fig. 1.

Fig. 3 is an elevation of an alternative form of construction of the grinder.

Fig. 4 is a section taken on line 4-4 of Fig. 3.

In the form of the invention shown in Fig. 1 there is a framework having a base I and side frame members 2 and 3 connected together at the top. The two side frames 2 and 3 are apertured to receive a shaft 4 to which a handle 5 is connected on one end.

On the shaft 4 and secured thereto is a ball 6 having a cylindrical groove I and a yoke 8 has its opposite ends each provided with a roller 9 riding in the groove. To this yoke is secured a shaft it having a gear II the teeth I2 of which are formed only on approximately one half the circumference thereof. n the gear I I is an arm I3 pivoted at I4 to the disc and a spring I tends to hold the arm against the stop pin [6 as shown in Fig. 2 in which position the end of the arm II provides a tooth between the double spaced teeth I3a and I3b as shown in Fig. 2. The teeth I2 of the gear II mesh with the gear I! on a shaft I8 which extends in parallel relation with the shaft I9 through an aperture in the base I. The shaft I8 is less in diameter than the portion I9 thereof which extends below the base member I and is provided with a means 20 at its lower end to support an abrading element (not here shown).

In operation the abrading element supported by the shaft I9 is held in contact with the sur face of an element to be surfaced. The gear has what may be termed a yieldable tooth provided by the arm I3 and in the oscillation of the shaft II] the spring restrained tooth will yield upon engagement with the tooth of the gear I1 and in effect jumps a tooth of the gear I2 and therefore changes the rotative position of the grinding, means carried by the element 26 on the shaft I9. Thus, as the shaft ID is oscillated, the grinder element is constantly changing in position about the axis of the shaft I9 on each revolution of the shaft I8 and extension I9 thereof.

Thus by the described arrangement and relationship of parts the crank 5 may be continuously rotated thereby causing the shaft II) to oscillate on its axis and change the toothed relationship of the gears and thereby avoiding the formation of a line on the valve seat that is not ground.

The same result is attained by the arrangement of parts shown in Fig. 3 in which the same yoke and ball arrangement as described relative to .Fig. 1 is provided whereby, through rotation of the driving shaft and the ball, the yoke 2| is caused to oscillate to thereby oscillate the gear 22 on the shaft 23 to which the yoke is secured. Due to the greater diameter of the gear 22 than that of the gear 24 meshing therewith, the gear 24 is caused to turn more than a half circle through each oscillation of the gear 23. Thus the grinding element attached to the supporting member 25 turns through more than a half circle thereby eliminating the formation of an unground line on the surface being ground.

It is further to be noted that the gear 24 is normally held out of mesh with the gear 22 by means of a spring 24a and, to bring the gears to mesh, pressure is applied to the framework 3a and, by relieving the pressure and turning the handle 5a a part turn, the rotative position of the grinding element is changed.

Both the devices herein disclosed are for the same purpose and effect the same result the only difference being in the character of the gearing between the oscillating member and the shaft to be oscillated thereby. The device as shown and described is comparatively simple and of inexpensive form and it is believed evident from the foregoing description and drawing that the various features and objects of the invention are attained by the structure shown.

Having thus briefly described my invention, its utility and mode of operation, what I claim and desire to secure by Letters Patent of the United States is:

1. A device for the purpose described comprising a frame, a rotatable shaft extending transversely thereof, a second shaft positioned at a right angle to the first shaft and supported by the frame, a yoke on the second shaft positioned within the frame and having eyed portions at a right angle to the longitudinal axis of the first shaft, a ball like element on the first shaft having a peripheral groove lying at an angle to the first shaft, roller like elements at each of the yoke ends engaging the groove on opposite sides of the first shaft, the arrangement providing that by rotation of the first shaft the second shaft is oscillated on its axis, a third shaft parallel with the second shaft, a gear on the second shaft, and a gear on the third shaft meshing therewith, the gear on the second shaft being of greater diameter than the gear on the third shaft, whereby oscillation of the second shaft through an arc of ninety degrees causes oscillation of the third shaft through an arc of greater than ninety degrees.

2. A device for the purpose described comprising a frame, a rotatable shaft extending transversely thereof, a second shaft positioned at a right angle to the first shaft and supported by the frame, a yoke on the second shaft positioned within the frame and having eyed portions at a right angle to the longitudinal axis of the first shaft, a ball like element on the first shaft having a peripheral groove lying at an angle to the 20 first shaft, roller like elements at each of the yoke ends engaging the groove on opposite sides of the first shaft, the arrangement providing that by rotation of the first shaft the second shaft is oscillated on its axis, a third shaft parallel with 25 the second shaft, a gear on the second shaft, and

a gear on the third shaft meshing therewith, the 1 4 gear on the second shaft being of greater diameter than the gear on the third shaft, said gear on the third shaft having a means providing a tooth extending between a pair of teeth thereof yieldably supported to permit movement thereof by engagement of the gear on the third shaft without materially affecting rotation thereof and functioning as a fixed tooth in the reverse movement of the first gear whereby the rotative position of the gear on the third shaft is changed at 'each oscillation of the second shaft.

JOSEPH S. KLEIN, JR.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 886,002 Koprive Apr. 28, 1908 942,222 Smith Dec. 7, 1909 996,435 Townsend June 27, 1911 1,146.03? Strine July 13. 1915 876,449 Fry Jan. 14, 1908 1,336,863 Runnion Apr. 13, 1920 1,567,782 Bern Dec. 29, 1925 

